CN110906692A - Novel wood drying pretreatment method - Google Patents
Novel wood drying pretreatment method Download PDFInfo
- Publication number
- CN110906692A CN110906692A CN201911014126.3A CN201911014126A CN110906692A CN 110906692 A CN110906692 A CN 110906692A CN 201911014126 A CN201911014126 A CN 201911014126A CN 110906692 A CN110906692 A CN 110906692A
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- Prior art keywords
- drying
- wood
- plate
- drying kiln
- board
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Sustainable Development (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a novel wood drying pretreatment method, however, the existing wood drying method has poor wood drying effect, the wood is easy to be stressed unevenly in the drying process, so that the phenomenon of drying crack occurs, the cost is improved, the existing wood drying method is complex, the drying time is slow, the drying speed is reduced, and the wood is easy to be influenced by the external environment in the drying process. The invention slowly raises and lowers the temperature according to a certain range, thereby leading the novel wood drying pretreatment method to have better drying effect on the wood, and leading the distance between the board A and the board A to be certain by the parting strips between the board A and the parting strips with different specifications regulated by the size of the board, thereby leading the stress of the wood to be more uniform easily in the drying process of the board A, and avoiding the occurrence of the dry cracking phenomenon and reducing the cost by raising the humidity inside the board A to be dried.
Description
Technical Field
The invention relates to the technical field of wood drying, in particular to a novel wood drying pretreatment method.
Background
In order to ensure the quality of the wood to be dried, the humidity of the drying medium (such as the humid air which is generally used at present) must also be controlled to obtain the effect of drying the wood quickly and with high quality, a process called wood drying.
However, the existing wood drying method has a poor drying effect on wood, and the wood is easily stressed unevenly in the drying process, so that the drying crack phenomenon occurs, the cost is increased, the existing wood drying method is complex, the drying time is slow, the drying speed is reduced, and the wood is easily influenced by the external environment in the drying process, so that the wood drying effect is poor.
Disclosure of Invention
The present invention aims to provide a novel pretreatment method for drying wood, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a novel wood drying pretreatment method specifically comprises the following steps:
step 1: before drying treatment is carried out on the wood, a drying kiln and equipment are checked;
step 2: selecting proper wood, cutting the wood into boards with the same thickness, length and width through a cutting machine, cleaning the boards, and cleaning chips on the surfaces of the boards to obtain the boards A.
And step 3: placing the plates A to be dried in a drying kiln in order, and then transversely placing a layer of parting beads between each layer of the plates A to obtain plates B;
and 4, step 4: preheating the plate B, heating the environment in the drying kiln at a heating rate of 3 ℃ per hour until the temperature in the drying kiln is raised to 45 ℃, and adjusting the environment humidity in the drying kiln to obtain a proper temperature;
and 5: and (3) pumping air inside the drying kiln through a pinhole pump, controlling the pressure inside the drying kiln to be between 0.1 and 0.01MPA, controlling the temperature to be 85 ℃, and keeping the temperature for 1 hour:
step 6: drying the plate B, raising the temperature in a drying kiln to 150 ℃ at a heating rate of 3 ℃ per hour, checking the water content of the plate B, and stopping drying when the water content of the plate B is reduced to 2% to obtain a plate C;
step 7; after drying, controlling the temperature inside the drying kiln to be 60 ℃, controlling the humidity to be 10% and keeping the temperature for a certain time;
and 8: and (5) cooling the drying kiln, stopping cooling when the water content in the plate C is reduced to the specified water content, and slowly moving out of the drying kiln.
Preferably, according to step 3, the division bars comprise hardwood division bars and softwood division bars, the spacing distance of the hardwood division bars is 15-18 times the thickness of the board, and the spacing distance of the softwood division bars is 20-22 times the thickness of the board.
Preferably, according to step 3, sheet a is 25mm by 25mm parting beads with a thickness below 40mm, and sheet a is 35mm by 35mm parting beads with a thickness above 50 mm.
Preferably, according to step 1, the inspection scope includes drying kiln housing, floor, gates, floor, ventilation system, heating system, humidity conditioning system, meters.
Preferably, according to step 4, the humidity inside the drying kiln is adjusted to a moisture content of 18% and maintained for a certain time.
Preferably, according to step 3, the division bars are placed crosswise to the sheet material a.
Compared with the prior art, the invention has the beneficial effects that: the invention slowly raises and lowers the temperature according to a certain range, thereby leading the novel wood drying pretreatment method to have better drying effect on the wood, and through the division bars between the plate A and the division bars with different specifications regulated by the size of the plate, so that a certain distance is left between the board A and the board A, thereby the board A is easy to make the wood stress more uniform in the drying process, and the humidity inside the board A is increased, thereby avoiding the occurrence of the dry cracking phenomenon, reducing the cost, simplifying the wood drying method by setting the drying time in a specific way, shortening the drying time, therefore, the drying speed is improved, and the interior of the drying kiln is in a vacuum environment through the vacuum pump, so that the wood is prevented from being easily influenced by the external environment in the drying process, and the drying effect of the wood is better.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provided by the invention comprises the following steps: a novel wood drying pretreatment method specifically comprises the following steps:
step 1: before drying treatment is carried out on the wood, a drying kiln and equipment are checked;
step 2: selecting proper wood, cutting the wood into boards with the same thickness, length and width through a cutting machine, cleaning the boards, and cleaning chips on the surfaces of the boards to obtain the boards A.
And step 3: placing the plates A to be dried in a drying kiln in order, and then transversely placing a layer of parting beads between each layer of the plates A to obtain plates B;
and 4, step 4: preheating the plate B, heating the environment in the drying kiln at a heating rate of 3 ℃ per hour until the temperature in the drying kiln is raised to 45 ℃, and adjusting the environment humidity in the drying kiln to obtain a proper temperature;
and 5: and (3) pumping air inside the drying kiln through a pinhole pump, controlling the pressure inside the drying kiln to be between 0.1 and 0.01MPA, controlling the temperature to be 85 ℃, and keeping the temperature for 1 hour:
step 6: drying the plate B, raising the temperature in a drying kiln to 150 ℃ at a heating rate of 3 ℃ per hour, checking the water content of the plate B, and stopping drying when the water content of the plate B is reduced to 2% to obtain a plate C;
step 7; after drying, controlling the temperature inside the drying kiln to be 60 ℃, controlling the humidity to be 10% and keeping the temperature for a certain time;
and 8: and (5) cooling the drying kiln, stopping cooling when the water content in the plate C is reduced to the specified water content, and slowly moving out of the drying kiln.
According to the invention, the air pressure in the drying kiln is stabilized between 0.1 and 0.01MPA, so that the plate is stressed more uniformly, the temperature in the drying kiln is raised to 45 ℃ at the temperature raising speed of 3 ℃ per hour until the temperature in the drying kiln is raised to 150 ℃, so that the plate is heated slowly, the plate is prevented from being broken, the cost is reduced, the service life of the plate is prolonged, and the drying effect of the plate is better.
Example 1
As a preferred embodiment of the present invention, according to step 3, the division bars include hardwood division bars and softwood division bars, the spacing distance of the hardwood division bars is 15-18 times the thickness of the board, and the spacing distance of the softwood division bars is 20-22 times the thickness of the board.
The novel wood drying pretreatment method has the advantages that the partition strips with different specifications are adopted, so that the isolation effect between the board A and the board A is better, the heating between the board A and the board A is more uniform, the drying effect of the board A is better, and the drying speed is accelerated.
Example 2
As a preferred embodiment of the invention, according to step 3, the thickness of sheet a is less than 40mm with 25mm by 25mm spacers and the thickness of sheet a is more than 50mm with 35mm by 35mm spacers.
The novel wood drying pretreatment method specifically regulates the thickness of the parting strips required by the board A, so that the stability of the board A is better, and the stress of the board A is more uniform.
Example 3
As a preferred embodiment of the present invention, according to step 1, the inspection range includes a drying kiln shell, a floor, a gate, a floor, a ventilation system, a heating system, a humidity control system, and meters, according to step 4, the humidity inside the drying kiln is adjusted to a moisture content of 18% and maintained for a certain time, and according to step 3, the division bars are placed across the board a.
The novel wood drying pretreatment method is used for inspecting a drying kiln shell, the ground, a gate, the ground, a ventilation system, a heating system, a humidity regulating system and instruments in advance, so that the influence of indefinite factors on plate drying is avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A novel wood drying pretreatment method is characterized in that: the method specifically comprises the following steps:
step 1: before drying treatment is carried out on the wood, a drying kiln and equipment are checked;
step 2: selecting proper wood, cutting the wood into boards with the same thickness, length and width through a cutting machine, cleaning the boards, and cleaning chips on the surfaces of the boards to obtain the boards A.
And step 3: placing the plates A to be dried in a drying kiln in order, and then transversely placing a layer of parting beads between each layer of the plates A to obtain plates B;
and 4, step 4: preheating the plate B, heating the environment in the drying kiln at a heating rate of 3 ℃ per hour until the temperature in the drying kiln is raised to 45 ℃, and adjusting the environment humidity in the drying kiln to obtain a proper temperature;
and 5: and (3) pumping air inside the drying kiln through a pinhole pump, controlling the pressure inside the drying kiln to be between 0.1 and 0.01MPA, controlling the temperature to be 85 ℃, and keeping the temperature for 1 hour:
step 6: drying the plate B, raising the temperature in a drying kiln to 150 ℃ at a heating rate of 3 ℃ per hour, checking the water content of the plate B, and stopping drying when the water content of the plate B is reduced to 2% to obtain a plate C;
step 7; after drying, controlling the temperature inside the drying kiln to be 60 ℃, controlling the humidity to be 10% and keeping the temperature for a certain time;
and 8: and (5) cooling the drying kiln, stopping cooling when the water content in the plate C is reduced to the specified water content, and slowly moving out of the drying kiln.
2. A novel wood drying pretreatment method according to claim 1, characterized in that: according to the step 3, the parting strips comprise hardwood parting strips and coniferous parting strips, the spacing distance of the hardwood parting strips is 15-18 times of the thickness of the board, and the spacing distance of the coniferous parting strips is 20-22 times of the thickness of the board.
3. A novel wood drying pretreatment method according to claim 7, characterized in that: according to step 3, plate a is 25mm by 25mm parting beads with a thickness below 40mm and plate a is 35mm by 35mm parting beads with a thickness above 50 mm.
4. A novel wood drying pretreatment method according to claim 1, characterized in that: according to the step 1, the inspection range comprises a drying kiln shell, the ground, a gate, the ground, a ventilation system, a heating system, a humidity conditioning system and an instrument.
5. A novel wood drying pretreatment method according to claim 1, characterized in that: according to step 4, the humidity inside the drying kiln is adjusted to a moisture content of 18% and maintained for a certain period of time.
6. A novel wood drying pretreatment method according to claim 1, characterized in that: according to step 3, the division bars are placed in a crossed manner with the plate A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014126.3A CN110906692A (en) | 2019-10-23 | 2019-10-23 | Novel wood drying pretreatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014126.3A CN110906692A (en) | 2019-10-23 | 2019-10-23 | Novel wood drying pretreatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110906692A true CN110906692A (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911014126.3A Pending CN110906692A (en) | 2019-10-23 | 2019-10-23 | Novel wood drying pretreatment method |
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| Country | Link |
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| CN (1) | CN110906692A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB465585A (en) * | 1935-08-06 | 1937-05-06 | Weserhuette Ag Eisenwerk | Improved apparatus for the production of warm air or gases, for drying wood and other structural materials |
| CN101020322A (en) * | 2007-02-26 | 2007-08-22 | 冯中清 | Process of producing color laminated board |
| CN102538437A (en) * | 2012-01-17 | 2012-07-04 | 北京林业大学 | Wood drying method |
| CN105403001A (en) * | 2015-11-18 | 2016-03-16 | 广德县常丰竹木业制品有限公司 | Wood drying method |
-
2019
- 2019-10-23 CN CN201911014126.3A patent/CN110906692A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB465585A (en) * | 1935-08-06 | 1937-05-06 | Weserhuette Ag Eisenwerk | Improved apparatus for the production of warm air or gases, for drying wood and other structural materials |
| CN101020322A (en) * | 2007-02-26 | 2007-08-22 | 冯中清 | Process of producing color laminated board |
| CN102538437A (en) * | 2012-01-17 | 2012-07-04 | 北京林业大学 | Wood drying method |
| CN105403001A (en) * | 2015-11-18 | 2016-03-16 | 广德县常丰竹木业制品有限公司 | Wood drying method |
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Application publication date: 20200324 |
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